EP0254350B1 - A soil cultivating machine - Google Patents
A soil cultivating machine Download PDFInfo
- Publication number
- EP0254350B1 EP0254350B1 EP19870201304 EP87201304A EP0254350B1 EP 0254350 B1 EP0254350 B1 EP 0254350B1 EP 19870201304 EP19870201304 EP 19870201304 EP 87201304 A EP87201304 A EP 87201304A EP 0254350 B1 EP0254350 B1 EP 0254350B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carrier
- roller
- cultivating machine
- soil cultivating
- frame portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B49/00—Combined machines
- A01B49/02—Combined machines with two or more soil-working tools of different kind
- A01B49/022—Combined machines with two or more soil-working tools of different kind at least one tool being actively driven
- A01B49/025—Combined machines with two or more soil-working tools of different kind at least one tool being actively driven about a substantially vertical axis
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B29/00—Rollers
- A01B29/04—Rollers with non-smooth surface formed of rotatably-mounted rings or discs or with projections or ribs on the roller body; Land packers
- A01B29/045—Rollers with non-smooth surface formed of rotatably-mounted rings or discs or with projections or ribs on the roller body; Land packers the soil-pressing body being a drum
Definitions
- the invention concerns a soil cultivating machine comprising a frame portion wherein a plurality of power-driven soil working members are supported in side-by-side relationship, whilst behind said soil working members there is arranged by means of pivotal arms a roller which, during operation, is movable relative to said frame portion about an at least substantially horizontal transverse axis and is afforded by a packer roller provided with scraper elements disposed at the rear thereof by means of a carrier and means are provided with the aid of which the carrier with the scraper elements is movable, during operation, in at least one direction relative to the arms for the roller.
- the frame portion carrying the soil working members can move upwardly relative to the arms and the roller about the pivotal axis for the arms when the soil working members hit an obstacle in the soil, so that damage to the soil working members is prevented.
- this disadvantage can be obviated in that the means include a connecting element arranged between the frame portion and the carrier for the scraper elements and with the aid of which the position of the scraper elements relative to the cylindrical carrier of the roller is adjusted upon an adjustment in height of the roller with respect to the frame portion.
- the carrier for the scraper elements when the frame portion deflects upwardly, can perform a relative movement with respect to the roller arms, as a result of which the upward movement of the frame portion is not impeded anymore.
- the implement shown in the drawings concerns a soil cultivating machine, in particular one for the preparation of a seed bed.
- the machine comprises a box-like frame portion 1 which extends transversely to the direction of operative travel A and in which are supported, spaced apart equidistantly by preferably 25 cms, the upwardly, preferably vertically, extending shafts 2 of soil working members 3.
- Each of the soil working members 3 includes an at least substantially horizontal carrier 4 which is mounted on that end of the shaft 2 projecting from the bottom of the frame portion 1 and whose ends are provided with downwardly extending soil working elements 5 in the form of tines.
- the ends of the box-like frame portion 1 are closed by means of plates 6 which extend at least substantially parallel to the direction of operative travel A.
- Each of the plates 6 is provided near its front upper side with a bolt 7 which extends transversely to the direction of operative travel A and about which is freely pivotal an arm 8 extending rearwardly along the inner side of a plate 6.
- Each of the arms 8 has at its rear end a plate-shaped support 9 extending obliquely downwardly and rearwardly.
- each of the supports 9 has a stub 10 extending transversely to the direction of operative travel A, the arrangement being such that the longitudinal centre lines thereof are in alignment.
- On the stubs 10 there is arranged freely rotatably a roller 11, which roller is designed as a packer roller.
- the packer roller 11 includes a cylindrical carrier 12 on which there are arranged equidistantly crowns of cams 13.
- Plate-shaped scraper elements 14 are provided between the crowns of cams 13. During operation, the scraper elements 14 assume a position as shown in detail in Figure 2, the free front end of a scraper element being located at least substantially near the lower side of the cylindrical carrier 12 bearing on the soil.
- Each of the plate-shaped scraper elements 14 is disposed at the lower side of an obliquely upwardly and rearwardly directed arm 15.
- the arms 15 are mounted on a carrier 16 which extends transversely to the direction of operative travel A and is positioned at least substantially parallel to the axis of rotation of the roller 11.
- an arm 17 extending obliquely downwardly and subsequently forwardly ( Figure 2), the ends of the carrier 16 are freely pivotal about the stubs 10 carrying the roller 11.
- the carrier 16 ( Figure 1) is provided at its upper side with two spaced-apart lugs 18, between which one end of a connecting element 19 in the form of a rod is disposed freely movably to all sides by means of a ball and socket joint, the other end being arranged freely movably to all sides by means of a ball and socket joint between two lugs 20 at the rear side of the frame portion 1.
- the lugs 20 at the rear side of the frame portion 1 are located in the region of a fourth soil working member 3, taken from an end of the frame portion 1.
- the respective connecting elements 19, which are adjustable in length, are provided such that, in plan view, they enclose an angle of approximately 50° to the direction of operative travel A of the machine.
- each of the plates 6 is provided with a support 21 which at the upper and lower sides has a portion 22 which is folded at a square angle.
- the portion 22 extends at least substantially horizontally, is directed inwardly and serves as a stop adapted to co-operate with an arm 8.
- the portions 22 are interconnected by a strip 23, the arrangement being such that the arm 8 is capable of movement between the strip 23 at the support 21.
- the support 21 and the strip 23 have curved rear sides, the arrangement being such that the curvature extends in accordance with a section of a circle having its centre on the longitudinal centre line of a bolt 7.
- each shaft 2 is provided with a pinion 26, the arrangement being such that the pinions on the shafts of adjacent soil working members 3 are in driving connection with each other.
- the shaft 2 of a soil working member 3 is extended upwardly and by means of this extension reaches to into a gear box 27, inside which the extension is in driving connection via a conical gear wheel transmission and a speed variator 28, located at the rear side of the gear box, with a shaft 29 which extends in the direction of operative travel A and projects at the front side from said gear box 27.
- the end of the shaft projecting from the gear box can be coupled to the power take-off shaft of a tractor via an intermediate shaft.
- the frame portion 1 includes near its centre a trestle 30 for coupling of the machine to the three-point lifting hitch of a tractor.
- the machine coupled to the three-point lifting hitch of a tractor via the trestle can be moved in a direction indicated by the arrow A, whereby each of the soil working members 3 can be rotated from the power take-off shaft via the intermediate shaft and the above-described transmission, the arrangement being such that adjacent soil working members rotate in opposite direction and, by means of their downwardly directed soil working members 5, cultivate at least adjoining strips of soil.
- the working depth of the soil working members 3 can be set with the aid of the roller 11 by introducing the pin 25 in one of the holes 24, the arrangement being such that the pin bearing on the upper side of the arms 8 prevents the frame portion 1 supporting the soil working members from moving downwardly to a further extent.
- the box-like frame portion 1 is capable of deflecting upwardly relative to the roller 11 and the arms 8 about the bolt 7.
- the connecting elements 19 ensure that the scraper elements 14 are retained in an appropriate position relative to the roller 11. If, for example, the box-like frame portion 1 is moved upwardly at one end because the soil working members 3 hit an obstacle in the soil, the connecting element 19 can effect a forward deflection of the carrier 16 for the scraper elements 14 about the pivotal axis 10, as a result of which the deflection of the box-like frame portion with the soil working members supported therein is not impeded.
- the use of the connecting elements 19 accomplishes that, when the roller 11 is readjusted relative to the box-like frame portion 1 for setting the working depth, the position of the scraper elements 14 is adapted automatically to the new position.
- the connecting elements 19 pivot the carrier 16 via the arms 17 to such an extent about the pivotal axis 10 that the scraper elements 14 move upwardly along the periphery of the cylindrical carrier 12.
- the relative movement between the roller 11 and the frame portion 1 ensures that the connecting elements 19 pivot the carrier 16 via the arms 17 to such an extent about the pivotal axis 10 that the scraper elements 14 move downwardly.
- the position of the scraper elements can be changed further by changing the length of the connecting elements 19.
- Figures 3 and 4 show an embodiment wherein only one connecting element 31 is present between the vertically movable frame portion 1 and the carrier 16 carrying the scraper elements 14.
- the connecting element 31 is provided between lugs 32 near the centre of the carrier 16 and supports 33 near the centre at the upper side of the frame portion 1.
- the ends of the carrier 16 are given a maximum freedom of movement, as a result of which the frame portion 1 is given a maximum freedom of movement when meeting obstacles in the soil, in particular if these obstacles hit the soil working members at the ends of said frame portion.
- the length of the connecting element 31 is also adjustable. Also with this construction, an automatic adaptation of the position of the scraper elements is obtained when the roller 11 is adjusted in height.
- Figure 5 illustrates an embodiment wherein a flexible connecting element 35 in the form of a chain is provided between a lug 34 at the ends of the carrier 16 for the scraper elements 14 and the upper side of an arm.
- the lower ends of the arms 17 for the carrier 16 have a forwardly directed support 36 which by means of a tension spring 37 is connected to the lower side of an arm 8, the arrangement being such that, during normal operation, the flexible connecting element 35 is kept under tension.
- said frame portion in the event the frame portion deflects, said frame portion can move independently of the carrier 16 for the scraper elements 14, so that said carrier does not impede any movement of the frame portion in height.
- an arm 38 for the carrier 16 is arranged pivotally near the centre by means of a shaft 39 at the lower side of a support 40 of an arm 8.
- the roller 11 and the carrier 16 can be pivoted together about the pivotal shaft 39.
- the ends of the carrier 16 or its centre may be connected to the frame portion 1, or to the ends of the arms 8, by means of a connecting element described in the foregoing.
- the respective arms 8 and 38 have such a recessed portion for accommodating, respectively, the stubs 10 and the pivotal shaft 39 that they are contained in said recessed portion with some play. This accomplishes that, when the frame portion 1 is moved upwardly, there is ample freedom of movement between the respective arms 8 and 38 and the respective stubs 10 and shaft 39.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Soil Working Implements (AREA)
- Agricultural Machines (AREA)
Description
- The invention concerns a soil cultivating machine comprising a frame portion wherein a plurality of power-driven soil working members are supported in side-by-side relationship, whilst behind said soil working members there is arranged by means of pivotal arms a roller which, during operation, is movable relative to said frame portion about an at least substantially horizontal transverse axis and is afforded by a packer roller provided with scraper elements disposed at the rear thereof by means of a carrier and means are provided with the aid of which the carrier with the scraper elements is movable, during operation, in at least one direction relative to the arms for the roller.
- With soil cultivating machines of the above-defined type, as known from the German patent application 3.431.333, the frame portion carrying the soil working members can move upwardly relative to the arms and the roller about the pivotal axis for the arms when the soil working members hit an obstacle in the soil, so that damage to the soil working members is prevented.
- However, in practice it has been found that with the known construction, when a soil working member remote from the centre hits an obstacle, the upward movement of the frame portion via the arms can be counter-acted by the carrier carrying the packer roller's movable scraper elements, it then even being possible for the roller to be lifted partly from the soil. This means that for the soil working members of the prior art construction there is not always a sufficient protection against damage when they hit obstacles in the soil.
- Now, by means of the construction according to the invention, this disadvantage can be obviated in that the means include a connecting element arranged between the frame portion and the carrier for the scraper elements and with the aid of which the position of the scraper elements relative to the cylindrical carrier of the roller is adjusted upon an adjustment in height of the roller with respect to the frame portion. Using this provision, the carrier for the scraper elements, when the frame portion deflects upwardly, can perform a relative movement with respect to the roller arms, as a result of which the upward movement of the frame portion is not impeded anymore.
- For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
- Figure 1 is a plan view of a soil cultivating machine having a construction according to the invention;
- Figure 2 is a view taken in the direction of the arrow II in Figure 1;
- Figure 3 is a plan view of part of a machine in accordance with a second embodiment according to the invention;
- Figure 4 is a view taken in the direction of the arrow IV in Figure 3;
- Figure 5 is a view in accordance with Figure 4 of a third embodiment of a construction according to the invention, and
- Figure 6 is a view in accordance with Figure 4 of a fourth embodiment of a construction according to the invention.
- The implement shown in the drawings concerns a soil cultivating machine, in particular one for the preparation of a seed bed.
- The machine comprises a box-like frame portion 1 which extends transversely to the direction of operative travel A and in which are supported, spaced apart equidistantly by preferably 25 cms, the upwardly, preferably vertically, extending shafts 2 of
soil working members 3. Each of thesoil working members 3 includes an at least substantially horizontal carrier 4 which is mounted on that end of the shaft 2 projecting from the bottom of the frame portion 1 and whose ends are provided with downwardly extendingsoil working elements 5 in the form of tines. The ends of the box-like frame portion 1 are closed by means ofplates 6 which extend at least substantially parallel to the direction of operative travel A. Each of theplates 6 is provided near its front upper side with a bolt 7 which extends transversely to the direction of operative travel A and about which is freely pivotal anarm 8 extending rearwardly along the inner side of aplate 6. Each of thearms 8 has at its rear end a plate-shaped support 9 extending obliquely downwardly and rearwardly. Near the lower side, each of thesupports 9 has astub 10 extending transversely to the direction of operative travel A, the arrangement being such that the longitudinal centre lines thereof are in alignment. On thestubs 10 there is arranged freely rotatably aroller 11, which roller is designed as a packer roller. Thepacker roller 11 includes acylindrical carrier 12 on which there are arranged equidistantly crowns ofcams 13. Plate-shaped scraper elements 14 are provided between the crowns ofcams 13. During operation, thescraper elements 14 assume a position as shown in detail in Figure 2, the free front end of a scraper element being located at least substantially near the lower side of thecylindrical carrier 12 bearing on the soil. Each of the plate-shaped scraper elements 14 is disposed at the lower side of an obliquely upwardly and rearwardly directedarm 15. Thearms 15 are mounted on acarrier 16 which extends transversely to the direction of operative travel A and is positioned at least substantially parallel to the axis of rotation of theroller 11. By means of an arm 17 extending obliquely downwardly and subsequently forwardly (Figure 2), the ends of thecarrier 16 are freely pivotal about thestubs 10 carrying theroller 11. Near the ends, the carrier 16 (Figure 1) is provided at its upper side with two spaced-apart lugs 18, between which one end of a connectingelement 19 in the form of a rod is disposed freely movably to all sides by means of a ball and socket joint, the other end being arranged freely movably to all sides by means of a ball and socket joint between twolugs 20 at the rear side of the frame portion 1. Thelugs 20 at the rear side of the frame portion 1 are located in the region of a fourthsoil working member 3, taken from an end of the frame portion 1. The respective connectingelements 19, which are adjustable in length, are provided such that, in plan view, they enclose an angle of approximately 50° to the direction of operative travel A of the machine. The rear side of each of theplates 6 is provided with asupport 21 which at the upper and lower sides has aportion 22 which is folded at a square angle. Theportion 22 extends at least substantially horizontally, is directed inwardly and serves as a stop adapted to co-operate with anarm 8. Theportions 22 are interconnected by astrip 23, the arrangement being such that thearm 8 is capable of movement between thestrip 23 at thesupport 21. Thesupport 21 and thestrip 23 have curved rear sides, the arrangement being such that the curvature extends in accordance with a section of a circle having its centre on the longitudinal centre line of a bolt 7. The rear side of thesupport 21 and thestrip 23 are both provided between theportions 22 with two interspaced rows ofholes 24, which extend parallel to the rear side of the support and the strip, respectively, and in one of which a pin 25 can be inserted, the arrangement being such that in operation of the machine the pin bears on the upper side of thearm 8, so that the working depth of thesoil working members 3 is determined by means of theroller 11. Inside the box-like frame portion 1, each shaft 2 is provided with apinion 26, the arrangement being such that the pinions on the shafts of adjacentsoil working members 3 are in driving connection with each other. Near the centre, the shaft 2 of asoil working member 3 is extended upwardly and by means of this extension reaches to into agear box 27, inside which the extension is in driving connection via a conical gear wheel transmission and aspeed variator 28, located at the rear side of the gear box, with ashaft 29 which extends in the direction of operative travel A and projects at the front side from saidgear box 27. The end of the shaft projecting from the gear box can be coupled to the power take-off shaft of a tractor via an intermediate shaft. Near its front end, the frame portion 1 includes near its centre atrestle 30 for coupling of the machine to the three-point lifting hitch of a tractor. - The machine described in the foregoing operates as follows:
- During operation, the machine coupled to the three-point lifting hitch of a tractor via the trestle can be moved in a direction indicated by the arrow A, whereby each of the
soil working members 3 can be rotated from the power take-off shaft via the intermediate shaft and the above-described transmission, the arrangement being such that adjacent soil working members rotate in opposite direction and, by means of their downwardly directedsoil working members 5, cultivate at least adjoining strips of soil. - As has already been observed, the working depth of the
soil working members 3 can be set with the aid of theroller 11 by introducing the pin 25 in one of theholes 24, the arrangement being such that the pin bearing on the upper side of thearms 8 prevents the frame portion 1 supporting the soil working members from moving downwardly to a further extent. - With the aid of the
scraper elements 14 disposed at the rear side of theroller 11 by means of thecarrier 16 and thearms 15 it is possible, during operation, to scrape-off in a very early stage the earth caught between the crowns ofcams 13, thus preventing clods of undesired size from being deposited on the seed bed to be prepared. If, during operation, one or more of thesoil working members 3 hits/ hit an obstacle in the soil, the box-like frame portion 1 is capable of deflecting upwardly relative to theroller 11 and thearms 8 about the bolt 7. In this situation, this upward deflection is not impeded by the presence of thecarrier 16 for thescraper elements 14, since this carrier is freely pivotal by means of the arms 17 about thestubs 10 which constitute a pivotal axis and at the same time an axis of rotation for theroller 11. - During operation, the connecting
elements 19 ensure that thescraper elements 14 are retained in an appropriate position relative to theroller 11. If, for example, the box-like frame portion 1 is moved upwardly at one end because thesoil working members 3 hit an obstacle in the soil, the connectingelement 19 can effect a forward deflection of thecarrier 16 for thescraper elements 14 about thepivotal axis 10, as a result of which the deflection of the box-like frame portion with the soil working members supported therein is not impeded. - Furthermore, the use of the
connecting elements 19 accomplishes that, when theroller 11 is readjusted relative to the box-like frame portion 1 for setting the working depth, the position of thescraper elements 14 is adapted automatically to the new position. Thus, when the roller moves downwardly relative to the frame portion, i.e. to a position of the roller for working less deeply, the connectingelements 19 pivot thecarrier 16 via the arms 17 to such an extent about thepivotal axis 10 that thescraper elements 14 move upwardly along the periphery of thecylindrical carrier 12. - When the roller moves upwardly relative to the frame portion, i.e. the setting of a deeper working depth, the relative movement between the
roller 11 and the frame portion 1 ensures that the connectingelements 19 pivot thecarrier 16 via the arms 17 to such an extent about thepivotal axis 10 that thescraper elements 14 move downwardly. The position of the scraper elements can be changed further by changing the length of the connectingelements 19. - Figures 3 and 4 show an embodiment wherein only one connecting
element 31 is present between the vertically movable frame portion 1 and thecarrier 16 carrying thescraper elements 14. In this situation, the connectingelement 31 is provided betweenlugs 32 near the centre of thecarrier 16 and supports 33 near the centre at the upper side of the frame portion 1. With this construction, the ends of thecarrier 16 are given a maximum freedom of movement, as a result of which the frame portion 1 is given a maximum freedom of movement when meeting obstacles in the soil, in particular if these obstacles hit the soil working members at the ends of said frame portion. The length of the connectingelement 31 is also adjustable. Also with this construction, an automatic adaptation of the position of the scraper elements is obtained when theroller 11 is adjusted in height. - Figure 5 illustrates an embodiment wherein a flexible connecting
element 35 in the form of a chain is provided between alug 34 at the ends of thecarrier 16 for thescraper elements 14 and the upper side of an arm. The lower ends of the arms 17 for thecarrier 16 have a forwardly directedsupport 36 which by means of atension spring 37 is connected to the lower side of anarm 8, the arrangement being such that, during normal operation, the flexible connectingelement 35 is kept under tension. Also in this embodiment, in the event the frame portion deflects, said frame portion can move independently of thecarrier 16 for thescraper elements 14, so that said carrier does not impede any movement of the frame portion in height. Furthermore in this embodiment, there is provided also an automatic adaptation of the position of the scraper elements upon readjustment of the roller. It is also possible for the length of the connecting element to be adjustable. - In the embodiment illustrated in Figure 6, an
arm 38 for thecarrier 16 is arranged pivotally near the centre by means of ashaft 39 at the lower side of asupport 40 of anarm 8. In this embodiment, theroller 11 and thecarrier 16 can be pivoted together about thepivotal shaft 39. The ends of thecarrier 16 or its centre may be connected to the frame portion 1, or to the ends of thearms 8, by means of a connecting element described in the foregoing. Therespective arms stubs 10 and thepivotal shaft 39 that they are contained in said recessed portion with some play. This accomplishes that, when the frame portion 1 is moved upwardly, there is ample freedom of movement between therespective arms respective stubs 10 andshaft 39. Using the construction described in the foregoing, it is achieved that means constituted by the respective pivotal shafts and connecting elements are present, by means of which upon upward movement of the frame portion 1 thecarrier 16 for thescraper elements 14, when asoil working member 3 hits an obstacle in the soil, cannot obstruct this movement, when the frame portion moves upwardly, thecarrier 16 can effect a relative movement with respect to thearms 8 to which theroller 11 is connected. Thus, even if an obstacle hits the soil working members at the ends of the frame portion, an effective upward movement of the frame portion is possible.
Claims (17)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8601828A NL8601828A (en) | 1986-07-14 | 1986-07-14 | SOIL TILLER. |
NL8601828 | 1986-07-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0254350A1 EP0254350A1 (en) | 1988-01-27 |
EP0254350B1 true EP0254350B1 (en) | 1991-01-09 |
Family
ID=19848311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870201304 Expired - Lifetime EP0254350B1 (en) | 1986-07-14 | 1987-07-09 | A soil cultivating machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0254350B1 (en) |
DE (1) | DE3767240D1 (en) |
NL (1) | NL8601828A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4238603A1 (en) * | 1992-11-16 | 1994-05-19 | Amazonen Werke Dreyer H | Height-adjustable support roller fitted behind cultivator or mower - has adjuster between wiper holders and machine frame for wiper adjustment |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3431333A1 (en) * | 1984-08-25 | 1986-03-06 | Rabewerk Heinrich Clausing, 4515 Bad Essen | Ground roller for the cultivation of arable land |
DE3513797A1 (en) * | 1985-04-17 | 1986-10-23 | Karl 3181 Bahrdorf Markgraf | Agricultural working appliance for ground working |
-
1986
- 1986-07-14 NL NL8601828A patent/NL8601828A/en not_active Application Discontinuation
-
1987
- 1987-07-09 EP EP19870201304 patent/EP0254350B1/en not_active Expired - Lifetime
- 1987-07-09 DE DE8787201304T patent/DE3767240D1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3767240D1 (en) | 1991-02-14 |
NL8601828A (en) | 1988-02-01 |
EP0254350A1 (en) | 1988-01-27 |
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